/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.entity.mime.content;

import org.apache.http.Consts;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MIME;
import org.apache.http.util.Args;

import java.io.*;
import java.nio.charset.Charset;

/**
 * Text body part backed by a byte array.
 *
 * @see org.apache.http.entity.mime.MultipartEntityBuilder
 * @since 4.0
 */
public class StringBody extends AbstractContentBody {

  private final byte[] content;

  /**
   * @since 4.1
   * @deprecated (4.3) use {@link StringBody#StringBody(String, ContentType)}
   * or {@link org.apache.http.entity.mime.MultipartEntityBuilder}
   */
  @Deprecated
  public static StringBody create(
    final String text,
    final String mimeType,
    final Charset charset) throws IllegalArgumentException {
    try {
      return new StringBody(text, mimeType, charset);
    } catch (final UnsupportedEncodingException ex) {
      throw new IllegalArgumentException("Charset " + charset + " is not supported", ex);
    }
  }

  /**
   * @since 4.1
   * @deprecated (4.3) use {@link StringBody#StringBody(String, ContentType)}
   * or {@link org.apache.http.entity.mime.MultipartEntityBuilder}
   */
  @Deprecated
  public static StringBody create(
    final String text, final Charset charset) throws IllegalArgumentException {
    return create(text, null, charset);
  }

  /**
   * @since 4.1
   * @deprecated (4.3) use {@link StringBody#StringBody(String, ContentType)}
   * or {@link org.apache.http.entity.mime.MultipartEntityBuilder}
   */
  @Deprecated
  public static StringBody create(final String text) throws IllegalArgumentException {
    return create(text, null, null);
  }

  /**
   * Create a StringBody from the specified text, MIME type and character set.
   *
   * @param text     to be used for the body, not {@code null}
   * @param mimeType the MIME type, not {@code null}
   * @param charset  the character set, may be {@code null}, in which case the US-ASCII charset is used
   * @throws UnsupportedEncodingException
   * @throws IllegalArgumentException     if the {@code text} parameter is null
   * @deprecated (4.3) use {@link StringBody#StringBody(String, ContentType)}
   * or {@link org.apache.http.entity.mime.MultipartEntityBuilder}
   */
  @Deprecated
  public StringBody(
    final String text,
    final String mimeType,
    final Charset charset) throws UnsupportedEncodingException {
    this(text, ContentType.create(mimeType, charset != null ? charset : Consts.ASCII));
  }

  /**
   * Create a StringBody from the specified text and character set.
   * The MIME type is set to "text/plain".
   *
   * @param text    to be used for the body, not {@code null}
   * @param charset the character set, may be {@code null}, in which case the US-ASCII charset is used
   * @throws UnsupportedEncodingException
   * @throws IllegalArgumentException     if the {@code text} parameter is null
   * @deprecated (4.3) use {@link StringBody#StringBody(String, ContentType)}
   * or {@link org.apache.http.entity.mime.MultipartEntityBuilder}
   */
  @Deprecated
  public StringBody(final String text, final Charset charset) throws UnsupportedEncodingException {
    this(text, "text/plain", charset);
  }

  /**
   * Create a StringBody from the specified text.
   * The MIME type is set to "text/plain".
   * The {@linkplain Consts#ASCII ASCII} charset is used.
   *
   * @param text to be used for the body, not {@code null}
   * @throws UnsupportedEncodingException
   * @throws IllegalArgumentException     if the {@code text} parameter is null
   * @deprecated (4.3) use {@link StringBody#StringBody(String, ContentType)}
   * or {@link org.apache.http.entity.mime.MultipartEntityBuilder}
   */
  @Deprecated
  public StringBody(final String text) throws UnsupportedEncodingException {
    this(text, "text/plain", Consts.ASCII);
  }

  /**
   * @since 4.3
   */
  public StringBody(final String text, final ContentType contentType) {
    super(contentType);
    Args.notNull(text, "Text");
    final Charset charset = contentType.getCharset();
    this.content = text.getBytes(charset != null ? charset : Consts.ASCII);
  }

  public Reader getReader() {
    final Charset charset = getContentType().getCharset();
    return new InputStreamReader(
      new ByteArrayInputStream(this.content),
      charset != null ? charset : Consts.ASCII);
  }

  @Override
  public void writeTo(final OutputStream out) throws IOException {
    Args.notNull(out, "Output stream");
    final InputStream in = new ByteArrayInputStream(this.content);
    final byte[] tmp = new byte[4096];
    int l;
    while ((l = in.read(tmp)) != -1) {
      out.write(tmp, 0, l);
    }
    out.flush();
  }

  @Override
  public String getTransferEncoding() {
    return MIME.ENC_8BIT;
  }

  @Override
  public long getContentLength() {
    return this.content.length;
  }

  @Override
  public String getFilename() {
    return null;
  }

}
